....
. . .
i,llill'i
AALBORG
INDUSTRIES
PHOTO
CELL OM8630_01#C.1
Photo cell
1
Language UK
Description
The RAR detector is used for supervision
of
yellow burning oil flames.
If
the photo
cell detects a missing flame, the burner stops instantaneously.
It
is not possible to start
the burner before the control system has been reset.
With this type
of
detector, the radiation
of
the oil flame in the visible band
of
the light
spectrum is used to generate a flame signal. The light-sensitive element is a photo cell.
When illuminated, it generates
DC
voltage which causes a current to flow to the input
of
the flame signal amplifier in the control unit. Hence, the photo cell is an active
detector.
The cell is insensitive to infrared radiation.
If
the burner is started with an illuminated
combustion chamber, the start sequence
of
the burner breaks, and an alarm for flame
failure will be indicated.
The number
of
photo cells for automatic operation and emergency operation depend
on the classification society.
1.1
Commissioning
The intensity
of
the light radiation can be checked by measuring the detector current
by means
of
a DC ampere meter (internal resistance 5000 ohm). Figure I shows the
measuring circuit.
Note:
If
the wiring
ofthe
photo cell
is
connected incorrectly, it
is
not possible to
start
the oil burner.
Measuring circuit
22
24
LAL2
..
.ILAL3
...
!
\
MLT----i-'
.22
24
LOK16
...
,
Figure 1
photcircax0460930en. wmf
21-27/60
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